Marquise Lab Grown Diamond Four Prong Solitaire Ring

IGI Report IncludedMade to OrderInsured Delivery

1 of 16

$619.00

Price updates with your selections

Independently graded by IGI IGI Report Included Selected 0.50 ct+ lab-grown center or primary diamond · IGI grading report · Signora Jewelry Certificate included. 1 ct lab-grown diamond · IGI report · Signora Certificate included.

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Metal:

Center Diamond:

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Ring size Choose one

Forever, A & J

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Engraving 0 / 20

Complimentary · hand-engraved to order · adds about 3–4 days.

Arrives 7 business days to make, then 5–8 insured & tracked.

30-day returns Courier, insurance & duties covered. No restocking fee.

Duties & taxesPrepaid at checkout. Nothing extra to pay on delivery.

Estimated dispatch: 7 business days Duties & taxes prepaid

Ring size guide

Lay a ring you own flat on the circle and slide until it sits just inside it — or set its inner diameter directly.

Measure the inside of a ring that already fits — inner edge to edge — with a ruler in mm, then set it below. No ring handy? Try Measure your finger.

14 mm 24 mm 17.3 mm

Inner diameter mm

US size

UK size

EU size

Circumference

54.3 mm

Between sizes? Always choose the larger size. Fingers are slightly bigger in the evening — measure then for the best fit.

Method 1 — Use an existing ring

Find a ring that fits the intended finger comfortably.
Place it flat and measure the inner diameter (inside edge to inside edge) in mm.
Enter that measurement in the Measure a ring tab.

Method 2 — Wrap and measure

Wrap a thin strip of paper around the base of your finger.
Mark where it overlaps — measure that length in mm (your circumference).
Divide by 3.1416 (π) to get your diameter, then use the Measure a ring tab.

Tip: Middle finger sizes typically run half a size larger than the ring finger. If between sizes, go up. Measure in the evening — fingers are slightly larger then.

7US size

US	UK	EU	Diameter	Circumference

Highlighted row = your converted size. Most common women's sizes are US 6–7. All measurements in mm.

Selected: —

The Signora Promise

Hand-finished in SuratMade to order

Reports where statedExact scope shown

Insured deliverySigned & tracked

Secure checkoutShopify checkout

Standard-design returns30-day eligibility

Final inspectionChecked before dispatch

About This Ring

Marquise Cut · Bezel

Center

Marquise Cut

Carat

1 ct

Customizable

Metal

Customizable

Setting

Bezel

An independent IGI grading report is included when the selected individual lab-grown center or primary diamond is 0.50 ct or larger.

Detail	Details
Ring style	Four Prong Solitaire
Center diamond	Marquise · 10 × 5 mm · approx. 1 ct (shown — choose 1 to 4.5 ct)
Total diamond weight	approx. 1 ct (1 stone) as shown
Stone type	Lab Grown Diamond (CVD)
Diamond quality	E–F colour · VS clarity
Setting	Bezel and four-prong settings
Finish	High Polish
Occasion	Engagement, Anniversary, Proposal

Made to order — select your options above. Want something fully custom?
Customize your jewelry here.

A marquise lab grown diamond, held simply so nothing competes with it. The bezel and four-prong settings keeps the stone secure and lets light reach it from every side.

Shown with a 1 ct centre — choose anything from 1 ct to 4.5 ct and the setting is made to fit.

Clean, timeless and easy to wear every day — the kind of engagement ring that never dates.

Design highlights

Marquise lab grown diamond centre, E–F colour, VS clarity
About 1 ct of diamonds in total as shown
Bezel and four-prong settings
Centre sizes from 1 ct to 4.5 ct
Made to order in your selected metal

About Lab Grown Diamonds

A marquise is a long, boat-shaped brilliant cut with two pointed tips. It has one of the largest faces of any shape for its carat weight, so it reads big and bold, and its length makes the finger look slimmer.

Every Signora Jewels diamond is grown in a controlled lab using the CVD process, producing a stone that is chemically, optically, and physically identical to a mined diamond — same hardness, same fire, graded on the same 4C scale. Because the supply chain is short and traceable, you get a larger, cleaner stone for the same budget and a documented origin, with no mining footprint.

FAQ

Is the diamond included?
Yes — the price includes every diamond shown in the design.

Are lab grown diamonds real diamonds?
Yes. They are identical to mined diamonds in chemistry, hardness, and sparkle, and are graded on the same 4C scale.

Will a straight wedding band sit next to it?
Yes. The slim profile leaves room for most straight or gently curved bands.

Can I get a different metal, size, or stone?
Choose your options on this page. For anything beyond that, we make custom pieces — Customize your jewelry here.

Can it be resized later?
Often, yes, but it depends on the design, metal and setting. Please contact us before any resizing so we can advise on the safest way to do it.

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